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Service Menu Parameters
81
Figure 69 Diagnostics/service mode screen, page 8 of 8
Valve Control—Controls the 3P valve(s). Control can be by either of two methods:
• A time-driven signal that uses a 3P valve’s travel time and the time that an open or closed output
is provided to a 3P valve to estimate its current position.
• A feedback signal from the valve that is required for Supply Air Control. The feedback signal
constantly provides the Liebert iCOM with the valve’s position, eliminating the need to reset the
valve(s) on a loss of power and provides a valve failure detection.
Start Valve Calibration—Changing this value to “Yes” starts the valve calibration procedure.
During this procedure the valve is positioned to a fully closed and fully opened state while the
feedback signal is monitored. The control then automatically saves the feedback signal voltage at the
two end points as its calibration reference during normal operation.
Calibration Status—Shows whether the calibration has been started: idle indicates calibration has
not begun; ongoing indicates calibration has begun. When calibration has been completed the status
will return to idle.
V1: 0% open = —Feedback voltage recorded when the valve is positioned at 0% during the
calibration.
V1: 100% open = —Feedback voltage recorded when the valve is positioned at 100% during the
calibration.
Current V1 Feedback—The valve’s current feedback voltage. This value changes as the valve
strokes to different open positions.
V2: 0% open = —For an optional secondary valve; operates the same as the V1
V2: 100% open = —For an optional secondary valve; operates the same as the V1.
Current V2 Feedback—For an optional secondary valve; operates the same as the V1.